After that, all that remains is to copy the entire set of 24 frames and then paste it again in the same layer, after the first, to extend it to fill all 48 frames. Once thats done then you can play with any other fireworks symbols that youve made, to create different iterations and colors, and different burst frequencies. I used my second fireworks symbol to make a quicker burst, and started it a few frames later than the original so they wouldnt explode at the exact same time.
I also used the Advanced settings from step 8 to adjust the color of the bursts so that they faded from the original colors into new colors. I dont quite like the way it looks, but its an example of how you can adjust the shade without making entirely new symbols. Give it a try for yourself.